What must be replaced if the rotor is hitting the motor?

When the rotor is hitting the motor, it is typically indicative of an alignment issue or a mechanical failure that is often traced back to the stator. The stator is the stationary part of the motor and plays a crucial role in producing the magnetic field required for the rotor to spin smoothly. If the stator is damaged, misaligned, or has components that are worn, it can cause the rotor to make contact with it, leading to potential damage to both components.

Replacing the stator is necessary to restore proper function and prevent further complications in the motor system. Ensuring proper alignment and functionality of the stator will help ensure that the rotor operates freely without obstruction, allowing the motor to run efficiently.

Other components like the capacitor, compressor, or start switch are not directly involved in the rotor's physical rotation within the motor itself, and while issues with these can affect overall system performance, they would not resolve the specific issue of the rotor hitting the motor.